I also take gabapentin and sometimes get this sense that i am totally off balance or like my body is moving before I am. It comes and goes there is a middle ear syndrome that can cause thesr same symptoms, but in my case I believe and so does my doc that its the meds

That's how I feel after taking it, fortunately the roller coaster feeling has eased, but I feel off balance and a moving feeling...weird stuff. However, it does help my nerve pain so I'll keep taking it and sure I'll adjust in time.